How do I go by troubleshooting NTP access for My domain controllers?

[drummelhart]

Last night, our IT Department started working on a major W32time issue in respect that none of our DCs or Exchange would sync.

We went through MS's Diagnostic Technet Pages and finally all Servers synced.

Now the problem is that the Main DPC is unable to sync with a Time Server outside the Network.

I have opened port 123 in and out for UDP as well as TCP.

What else would I be missing?

 

[North323]

check the logs...what is being denied? can the server ping the ntp server? is there a route missing? do you have a web proxy? does that need to be unblocked?

 

[drummelhart]

We do not have a proxy.

From 10.10.0.202/2257 Dest 1.1.1.1/445

That is an example of what I receieved when using a show logging

I know we can ping out.

We were able to run another MS-Dos prompt that showed the difference in time between the Time server and our PDC.

All routes are configured properly

 

[North323]

then is it trying to get time from another source?

 

[burtsbees]

SMS-STL-Edge#deb ntp ?
adjust NTP clock adjustments
authentication NTP authentication
events NTP events
loopfilter NTP loop filter
packets NTP packets
params NTP clock parameters
refclock NTP reference clocks
select NTP clock selection
sync NTP clock synchronization
validity NTP peer clock validity

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[drummelhart]

I do not have NTP running on my PIX.

I will configure this tomorrow for a starting test.

All I have done so far is opened NTP Ports allowing my DC's to sync with at Stratum 1 yet nothing happens

 

[burtsbees]

Is it the ASA that you had to open ports on, or a router?

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[drummelhart]

PIX. It is a couple years too old to meet ASA specs

 

[burtsbees]

Post a config of the PIX...

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[drummelhart]

User Access Verification

Password:
Type help or '?' for a list of available commands.
HQFire1> en
Password: ***********
Invalid password
Password: ***********
HQFire1# show run
: Saved
:
PIX Version 6.3(1)
interface ethernet0 100full
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password opK/WR96WyIoG3el encrypted
passwd opK/WR96WyIoG3el encrypted
hostname HQFire1
domain-name strategysoftware.com
clock timezone gtm -8
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol pptp 1723
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
fixup protocol sqlnet 1521
names
name 10.10.0.201 DC1
name 10.10.0.202 DC2
name 10.10.0.208 NAS1
name 10.10.0.219 Mars
name 10.10.0.220 Titania
name 10.10.0.177 Jupiter
name 10.10.0.178 Mercury
name 173.10.87.177 Jupiter_outside
name 173.10.87.178 Mercury_outside
access-list acl-nat0 permit ip 10.10.0.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list acl-nat0 permit ip 10.10.0.0 255.255.255.0 10.10.11.0 255.255.255.0
access-list inside-outside permit tcp any any eq 123
access-list inside-outside permit udp any any eq ntp
access-list inside-outside permit tcp host Jupiter any eq domain
access-list inside-outside permit udp host Jupiter any eq domain
access-list inside-outside permit tcp host Jupiter any eq smtp
access-list inside-outside permit tcp host DC1 any eq domain
access-list inside-outside permit udp host DC1 any eq domain
access-list inside-outside permit tcp host DC2 any eq domain
access-list inside-outside permit udp host DC2 any eq domain
access-list inside-outside permit tcp host DC1 any eq www
access-list inside-outside permit tcp host DC2 any eq www
access-list inside-outside permit udp host DC1 any eq ntp
access-list inside-outside permit udp host DC2 any eq ntp
access-list inside-outside permit tcp any any eq 3389
access-list inside-outside permit tcp any any eq smtp
access-list inside-outside permit tcp any any eq ftp
access-list inside-outside permit tcp any any eq www
access-list inside-outside permit tcp any any eq https
access-list inside-outside permit tcp any any eq nntp
access-list inside-outside permit tcp any any eq 563
access-list inside-outside permit tcp any any eq pop3
access-list inside-outside permit tcp any any eq 995
access-list inside-outside permit tcp any any eq pptp
access-list inside-outside permit tcp any any eq 8100
access-list inside-outside permit tcp any any eq 8101
access-list inside-outside permit tcp any any eq ssh
access-list inside-outside permit udp any any eq isakmp
access-list inside-outside permit udp any any
access-list outside-inside permit tcp any any eq 123
access-list outside-inside permit udp any any eq ntp
access-list outside-inside permit tcp any host Jupiter_outside eq smtp
access-list outside-inside permit tcp any host Jupiter_outside eq 995
access-list outside-inside permit tcp any host Mercury_outside eq www
access-list outside-inside permit tcp any host Mercury_outside eq https
access-list outside-inside permit tcp any host Mercury_outside eq 8080
access-list outside-inside permit tcp any any eq pop3
pager lines 24
logging on
logging timestamp
logging monitor errors
logging buffered informational
logging queue 0
mtu outside 1500
mtu inside 1500
ip address outside xxx.xxx.xxx.181 255.255.255.248
ip address inside 10.10.0.213 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool RADIUSpool 10.10.10.10-10.10.10.254
ip local pool IpsecL2tpPool 10.10.11.1-10.10.11.254
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list acl-nat0
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) Jupiter_outside Jupiter netmask 255.255.255.255 500 1000

static (inside,outside) Mercury_outside Mercury netmask 255.255.255.255 500 1000

access-group outside-inside in interface outside
access-group inside-outside in interface inside
route outside 0.0.0.0 0.0.0.0 173.10.87.182 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server RADIUS (inside) host DC1 xxxxxxxx timeout 10
aaa-server RADIUS (inside) host DC2 xxxxxxxx timeout 10
aaa-server LOCAL protocol local
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
sysopt connection permit-l2tp
crypto ipsec transform-set l2tp_TransformSet esp-3des esp-sha-hmac
crypto ipsec transform-set l2tp_TransformSet mode transport
crypto dynamic-map l2tp_DynMap 30 set transform-set l2tp_TransformSet
crypto map l2tp_Map 30 ipsec-isakmp dynamic l2tp_DynMap
crypto map l2tp_Map interface outside
isakmp enable outside
isakmp key ******** address 0.0.0.0 netmask 0.0.0.0
isakmp nat-traversal 20
isakmp policy 5 authentication pre-share
isakmp policy 5 encryption 3des
isakmp policy 5 hash sha
isakmp policy 5 group 2
isakmp policy 5 lifetime 28800
telnet 67.183.62.160 255.255.255.255 outside
telnet 98.117.111.181 255.255.255.255 outside
telnet 98.117.114.120 255.255.255.255 outside
telnet 10.10.0.0 255.255.0.0 inside
telnet timeout 5
ssh 98.117.114.120 255.255.255.255 outside
ssh 98.117.111.181 255.255.255.255 outside
ssh 67.183.62.160 255.255.255.255 outside
ssh timeout 30
console timeout 0
vpdn group vpn-pptp-group accept dialin pptp
vpdn group vpn-pptp-group ppp authentication mschap
vpdn group vpn-pptp-group ppp encryption mppe 128 required
vpdn group vpn-pptp-group client configuration address local RADIUSpool
vpdn group vpn-pptp-group client configuration dns DC1 DC2
vpdn group vpn-pptp-group client configuration wins DC1 DC2
vpdn group vpn-pptp-group client authentication aaa RADIUS
vpdn group vpn-pptp-group pptp echo 60
vpdn group l2tp_group accept dialin l2tp
vpdn group l2tp_group ppp authentication pap
vpdn group l2tp_group client configuration address local IpsecL2tpPool
vpdn group l2tp_group client configuration dns DC1 DC2
vpdn group l2tp_group client configuration wins DC1 DC2
vpdn group l2tp_group client authentication aaa RADIUS
vpdn group l2tp_group l2tp tunnel hello 60
vpdn username SSIHQ\kmcdaniel password *********
vpdn username kmcdan password *********
vpdn enable outside
username KMcDaniel password 6bD4LWfwbkzV4d.O encrypted privilege 15
terminal width 80
Cryptochecksum:4e52bcf4587b3ee3960aed8e262c2353
: end
HQFire1#

 

[unclerico]

I saw your post over in the Win2k3 forum; i replied to that post...

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[burtsbees]

Are there any available interfaces? To eliminate the PIX as a cause, I would set up a router to get NTP through the PIX on an available interface, if this is possible. Post back if you can do this or if you need help. You are clearly letting in and out the proper ports, as far as I can tell.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[burtsbees]

The other thing to do is SPAN the ports in a switch with the necessary input ports (DC) and output ports (protocol analyzer) in both directions, and look for NTP packets. Also, traceroute from the DC out to the NTP server on the outside.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[drummelhart]

I do not have a Router. My PIX's are both 506E and therm mon does not work.

We did a packet sniff Friday, and you can see when we ask the Time Server to look at its clock and ours with the time difference. Yet when we sync the PDC, we receive nothing. I am thinking we have DC's with incorrect firewall settings or something. You look for the similar thread on W2k3 as well